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由 John Bowler 提交于
READ_GAMMA. Prior to 1.6.0 switching off READ_GAMMA did unpredictable things to the interfaces that use it (specifically, png_do_background in 1.4 would simply display composite for grayscale images but do composition with the incorrect arithmetic for color ones). In 1.6 the semantic of -DPNG_NO_READ_GAMMA is changed to simply disable any interface that depends on it; this obliges people who set it to consider whether they really want it off if they happen to use any of the interfaces in question (typically most users who disable it won't).
ab1477d6
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